How to draw multiple line without adding series?

[goodsj]

For example, I have a sales chart by item with teechart.

before.jpg (143.94 KiB) Viewed 17602 times

I want to add break-even point line on 450.

after.jpg (150.85 KiB) Viewed 17602 times

How can I implement it? I think it would be good if you give me a sample

Thank you.

[Christopher]

How can I implement it? I think it would be good if you give me a sample

Of course - you can find the sample I refer to below in the TeeChart for .NET C# Windows Forms examples repo under the 'Feature Demo' folder. The sample shows TeeChart's canvas events which allow you to draw lines, shapes, text and images at any point of the chart at different times of its painting routine:

TeeChartNetExamples_Ek94xF71VG.png (187.6 KiB) Viewed 17581 times

[goodsj]

Thanks for answering.

I could draw line with Graphics3D, Point.

but, I couldn't set 450 its line position dynamically regardless of chart size.

[Christopher]

but, I couldn't set 450 its line position dynamically regardless of chart size.

You can fix the point by getting the Axis to calculate the pixel value of the Axis value for you, e.g.

Code: Select all

		private void TChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
		{
			var yVal = tChart1.Axes.Left.CalcPosValue(450);
			g.Pen.Color = Color.Red;
			g.HorizontalLine(tChart1.Chart.ChartRect.Left, tChart1.Chart.ChartRect.Right, yVal);
		}

[goodsj]

Thanks to you, we solved the problem.